Feature extraction plays an important role in content based image retrieval to support for efficient and fast retrieval of similar images from image databases. Significant features must first be extracted from image data. Retrieving images by their content as opposed to external features has become an important operation. A fundamental ingredient for content based image retrieval is the technique used for comparing images. There are two general methods for image comparison: Intensity based (color and texture) and Geometry based (shape).
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